We know this from experiments on a diverse menagerie of model organisms in labs around the world. And much as my own research began with experiments with yeast, much of the initial work that has been done to understand rapamycin was completed on S. cerevisiae. If you put 2,000 normal yeast cells into a culture, a few will remain viable after six weeks. But if you feed those yeast cells rapamycin, in six weeks about half will still be healthy.7 The drug will also increase the number of daughter cells mothers can produce by stimulating the production of NAD.
